Kristin Saltonstall (IMAGE) Smithsonian Tropical Research Institute Caption Kristin Saltonstall, cientÃfica de STRI, está fascinada por las grandes especies de pastos invasores, que a menudo cambian radicalmente los ecosistemas que invaden. Credit Sean Mattson Usage Restrictions Please credit Sean Mattson License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.